Mariah Carey performed at the event.
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All The Photos You Need To See From Inside The 2015 Billboard Music Awards
![Mariah Carey Billboard Music Awards 2015 Performan](https://assets.capitalxtra.com/2015/20/mariah-carey-billboard-music-awards-2015-performance--1431936849-view-4.jpg)
21. Mariah Carey performed at the event.
Picture: Getty
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All The Photos You Need To See From Inside The 2015 Billboard Music Awards
Picture: Getty